Development and applications of DifferentialGeometry are supported in part by National Science Foundation grants OCI-1148331, DMS-071380, DMS-0410373.
The Spacetime Geometry of a Null Electromagnetic Field, Charles G. Torre; Classical and Quantum Gravity
GR 20 Workshop, Warsaw, July 2013, Ian M. Anderson and Charles G. Torre
The Spacetime Geometry of an Electromagnetic Wave, Charles G. Torre
The Spacetime Geometry of a Null Electromagnetic Field, Charles G. Torre
New symbolic tools for differential geometry, gravitation, and field theory, Ian Anderson and Charles Torre; Journal of Mathematical Physics